Variables: concentration Keywords: stream pesticides pyrethroids Substances: Acrinathrin (YLFSVIMMRPNPFK-WEQBUNFVSA-N) Chlorpyrifos (SBPBAQFWLVIOKP-UHFFFAOYSA-N) Chlorpyrifos-methyl (HRBKVYFZANMGRE-UHFFFAOYSA-N) Cypermethrin (KAATUXNTWXVJKI-UHFFFAOYSA-N)